The Double-Decker Roundhouse with Elevating Turntable is an accessory piece for the Chuggington Wooden Railway. It comes with a bonus switch track, six engine bays, a removable tunnel cap, and a moveable turntable. The turntable turns so that it lines up with the engine bays. Raise and lower the turntable by pressing a button. Kids can play with the roundhouse in its double-decker form or they can unstack the engine bays. http://www.timetoplaymag.com/toys/2525/learning-curve/chuggington-wooden-railway-double-decker-roundhouse-with-elevating-turntable/